THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
Map-Join Partition Pruning Optimization
Overview
In Hive Map-Join is a technique that materializes data for all tables involved in the join except for the largest table and then large table is streamed over the materialized data from small tables. Map-Join is often a good join approach for star-schema joins where the fact table will be streamed over materialized dimension tables.
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